HOME-FLEX 11-436-007 Installation guide

Brand: HOME-FLEX

Model: 11-436-007

Type: Installation guide

System Design and

Installation Manual

CSST Flexible Gas Pipe

Suggested Tools for Installation of HOME-FLEX®

Use to cut HOME-FLEX® tubing to

desired length.

Note: Turn knob slowly while rotating

around the tubing to avoid bending or

crushing the tubing.

Tubing Cutter

Use to remove yellow protective jacket

at tubing end where the tting is to be

installed.

Utility Knife

Use to rst pull open, and then to

secure, the retainer ring in place on

rst corrugation (or valley) of the

HOME-FLEX® tubing.

Slip-joint (or similar)

Pliers (x2)

Use in tting assembly to fuse the CSST

and NPT ends of the tting.

Note: Hold the NPT end of the tting

steady while tightening from the CSST

end.

(¾" ttings require 1½" or larger wrench opening)

Crescent Wrenches (x2)

Gloves Eye Protection

Escanear el código QR de la derecha, o vaya a

es.homeex.com, para descargar la versión española

del Manual de Instalación y Diseño del Sistema.

Table of Contents

Chapter 1: Introduction

1.1 User Warnings.........................................................1

1.2 Limitations of Manual..................................................2

1.3 Applicable Codes and Standards .......................................3

Chapter 2: Description of System Components

2.1 Tubing ................................................................4

2.2 Fittings ...............................................................5

2.3 Striker Plates ..........................................................5

2.4 Pressure Regulators....................................................6

2.5 Manifolds .............................................................6

2.6 Shut-o valves and Quick-Connect Devices .............................6

2.7 Bonding Clamps .......................................................6

2.8 Protection Devices.....................................................7

2.9 Replacement Parts.....................................................7

2.10 HOME-FLEX® Appliance Connectors ...................................8

Chapter 3: Sizing and Congurations

3.1 Conguration .........................................................9

Low Pressure Systems .............................................10

Dual Pressure Systems.............................................11

Hybrid Systems (Rigid pipe and CSST)..............................11

3.2 Sizing Methods and Examples..........................................11

Sizing Tables ......................................................11

Low Pressure systems (Longest Length/Branch Method)............12

Elevated Pressure Systems .........................................14

Hybrid CSST & Black Iron Rigid Pipe Systems .......................16

Chapter 4: Installation Practices

4.1 General Practices ......................................................18

4.2 Fitting Assembly.......................................................19

Troubleshooting Fitting Connections ..............................20

4.3 Routing ...............................................................21

General Routing Practices .........................................21

Clearance Holes and Notching .....................................21

Concealed Locations for Fittings ...................................22

Outdoor Installation Issues ........................................23

4.4 Protection.............................................................24

Striker Plates ......................................................24

Through-Wall Penetration .........................................25

4.5 Meter connections.....................................................25

Connection by Special Termination Fitting .........................26

Direct Connection.................................................26

4.6 Appliance connections.................................................26

Termination Fittings with Appliance Connectors....................26

Direct Connection.................................................27

Pad-Mounted Equipment..........................................27

Roof Top Equipment...............................................27

Outdoor Appliances: Barbecue Grills, Gaslights, and Heaters . . . . . . . . 28

4.7 Manifold Stations......................................................29

4.8 Pressure Regulators....................................................29

Installation Requirements .........................................29

Vent Limiters and Vent Lines .......................................30

Performance Testing...............................................30

Regulator Adjustments ............................................31

4.9 Underground Installations .............................................31

4.10 Electrical Bonding ....................................................31

Chapter 5: Inspection, Repair, and Replacement of CSST

5.1 Minimum Inspection Requirements Checklist ...........................33

5.2 Repair of Damaged Tubing .............................................34

When Pipe Needs to be Replaced

..................................34

Method Of Repair: Splice or Replace?

..............................34

Chapter 6: Pressure Test Procedures

6.1 Procedure For Low Pressure Systems ...................................35

6.2 Procedure For Elevated Pressure Systems ...............................35

6.3 Appliance Connection Check Procedure ................................36

Chapter 7: Sizing/Capacity Tables

7.1 Natural Gas Sizing Tables...............................................37

7 in / 0.5 in WC Drop...............................................38

7 in / 1 in WC Drop ................................................38

8-10 in / 3 in WC Drop .............................................39

12-14 in / 6 in WC Drop ............................................39

2 PSI / 1 PSI Drop ..................................................40

5 PSI / 3.5 PSI Drop ................................................40

7.2 Liquid Petroleum (LP) Sizing Tables .....................................41

11 in / 0.5 in WC Drop..............................................41

13-14 in / 2.5 in WC Drop ..........................................41

2 PSI / 1 PSI Drop ..................................................42

5 PSI / 3.5 PSI Drop ................................................42

7.3 Steel Pipe Capacity Chart ..............................................43

7 in / 0.5 in WC Drop...............................................43

Chapter 8: Denitions......................................................44

Chapter 1: Introduction

1.1 User Warnings

HOME-FLEX® Corrugated Stainless Steel Tubing (CSST) exible gas piping material must be

installed by a Qualied Installer who has been certied in the use of the HOME-FLEX® or

VPC Alpha-FLEX™ gas piping systems. Certication can be completed by reading this System

Design and Installation Manual and registering with Valencia Pipe Company to obtain a Quali-

ed Installer Card by either mailing in the registration card at the back of the manual, or lling

out the online form at register.homeex.com. In submitting either the printed or online regis-

tration, you are asserting that you understand all aspects of the installation requirements and

local plumbing, mechanical, electrical and/or building codes applicable at the locale were

HOME-FLEX® is to be installed. If you do not understand all aspects of the installation require-

ments and local codes, locate a Qualied Installer in your area who does. You must presently

possess, or attain prior to installing, a HOME-FLEX® or VPC Alpha-FLEX™ Qualied Installer

Card to install HOME-FLEX® CSST.

Additional resources beyond this guide can be accessed on the HOME-FLEX® web site:

http://homeex.com. Installers must meet applicable qualications set forth by the state and/

or local administrative authorities which enforce the plumbing, mechanical and/or electrical

codes where the gas piping is being installed.

This HOME-FLEX® System Design and Installation Manual provides general instructions for the

design and installation of exible gas piping systems using HOME-FLEX® or VPC Alpha-FLEX™

branded CSST. It is not to be used as a guide for the installation of other manufacturers' CSST

products.

The HOME-FLEX® System Design and Installation Manual is to be used in conjunction with

state and local building codes. In the event of a conict between this guide and local codes,

the local code takes precedence. In the absence of local codes, installation shall comply

with the current edition of the National Fuel Gas Code (ANSI Z223.1/NFPA 54), the National

Standard of Canada, the Natural Gas and Propane Installation Code (CSA B149.1), the Uniform

Plumbing Code, the Federal Manufactured Home Construction and Safety Standards (ICC/ANSI

2.0), the Standard on Manufactured Housing (NFPA 501), the National Electric Code (NFPA 70),

and/or the Standard for the Installation of Lightning Protection System (NFPA 78), as applicable.

The instructions and procedures outlined in the HOME-FLEX® System Design and Installation

Manual must be strictly adhered to for a safe and eective installation. Prior to beginning

installation, competent engineering practices and principles must be employed in designing

the system, taking into account local codes, requirements of the natural gas utility or propane

supplier, and the requirements of the gas system being installed. All installations must be

inspected by the local authority that oversees gas plumbing prior to the supplying of gas to

the system.

HOME-FLEX® tubing and ttings are engineered and tested to work in combination.

HOME-FLEX® components are interchangeable with VPC Alpha-FLEX™ components. With the

exception of VPC Alpha-FLEX™, using HOME-FLEX® CSST tubing or ttings with the tubing or

ttings of other CSST exible gas piping manufacturers is strictly prohibited and could lead

to serious bodily injury or property damage.

Exposure to high voltage electricity may cause damage to CSST systems. Strict adherence to

Section 4.10, “Electrical Bonding” (p. 31), will mitigate potential damage.

WARNING! If installed improperly, re, explosion or asphyxiation may result. Installation

instructions and applicable local codes must be strictly followed.

Valencia Pipe Company

28839 Industry Drive Phone: 661-257-4403 Email: info@homeex.com

Valencia CA 91355 Fax: 661-257-3928 www.homeex.com

HOME-FLEX

Introduction

1.2 Limitations of Manual

This System Design and Installation Manual is intended to assist the professional gas pipe

installer in the design, installation, and testing of the HOME-FLEX® exible gas piping system

for residential, commercial, and industrial buildings. It is not possible for this guide to antici-

pate every variation in construction style, building conguration, appliance requirement,

or local restriction. This document will not cover every application. The user should either

exercise his own engineering judgement on system design and installation, or seek technical

input from qualied sources. Additional information on gas piping systems is available from

your local gas utility or propane supplier. General usage guidelines of HOME-FLEX® exible

gas piping are outlined as follows:

The piping system is for use with fuel gases only and is intended for operating pressures not

exceeding 5 PSI (34.5 kPa) or 25 PSI (172.5 kPa). The maximum actual operating pressure,

including transients, shall not in any case exceed 6.5 PSI (44.8 kPa) for 5 PSI (34.5 kPa) rating

or 30 PSI (207 kPa) for 25 PSI rating.

Precautions shall be taken by the installer to ensure any exposed tubing is not damaged or

abused during building construction or reconstruction.

Only the components provided or specied by Valencia Pipe Company, Inc. are to be used in

the installation.

The size and depth of installation clearance holes or notches for routing the tubing through

wall studs and joists shall comply with the requirements of the local building code.

Concealed tubing shall be protected from puncture threats, using the shielding devices spec-

ied by Valencia Pipe Company, at all points of penetration through studs, joists, plates or

similar structures. The extent of protection shall be dened as follows:

• At points of penetration less than 2" (50.8 mm) from any edge of a stud, joist, plate,

etc., a listed striker plate is required to provide protection at the area of support

and within 5 in (127 mm) of each side (if appropriate) of the support.

• At points of penetration 2" - 3" (50.8 to 76.2 mm) from any edge of a stud, joist,

plate, etc., a listed striker plate is required to provide protection throughout the

area of support.

• At points of penetration greater than 3" (76.2 mm) from any edge of a stud, joist,

plate, etc., no protection is required.

• Tubing routed horizontally through studs shall be protected from puncture

threats between the studs using the shielding devices specied.

• Tubing greater than 1" (25.4 mm) inside diameter installed within hollow cavity

walls of 2 x 4 construction shall be protected along the entire concealed length in

the manner and using the shielding devices specied by Valencia Pipe Company.

• The width of the installed striker plate, at the points of penetration through wall

studs, oor joists, plates, sills, etc., shall be at least 1.5 times the outside diameter

of the tubing.

The inspection, testing and purging of the installation shall be performed using the proce-

dures specied in Part 4, General, of the National Fuel Gas Code (ANSI Z223.1/NFPA 54), and/

or the Natural Gas and Propane Installation Code (CSA B149.1), the International Fuel Gas Code,

the Uniform Plumbing Code, or in accordance with the requirements of the applicable local

codes. The installed gas piping system shall not exhibit any loss of pressure during the eld

pressure test.

When routing HOME-FLEX® tubing, sharp bends, stretching, and kinking or twisting of the

tubing are to be avoided as these can damage the CSST tubing. The minimum permissible

bend radius of HOME-FLEX® tubing is 1¼" (32 mm) for ½" tubing, 1⁄" (42 mm) for ¾" tubing,

Applicable Codes and Standards

and 2" (51 mm) for 1" tubing. Under no circumstances is this minimum bend radius to be

exceeded.

The piping system shall not be used as a grounding electrode for an electrical system.

1.3 Applicable Codes and Standards

Model codes which list CSST as an acceptable gas piping material:

ANSI/IAS LC-1 / CSA 6.26 Standard

CANADA-CSA B149.1 Natural Gas and Propane Installation Code

NFPA 54/ANSI Z 223.1 National Fuel Gas Code

ICBO: Uniform Mechanical Code

ICC: International Mechanical Code

California Mechanical and Plumbing Codes

ICC: International Fuel Gas Code

NFPA 58 LP-Gas Code

IAPMO: Uniform Plumbing Code

ICC: International Residential Code

Tested to Code Requirements per ASTM E84 / UL 723

This System Design and Installation Manual has been written in accordance with the most

current edition of ANSI LC1 CSA 6.26, Fuel Gas Piping Systems using Corrugated Stainless Steel

Tubing (CSST).

Items marked with the UPC logo are IAPMO certied for the United

States and Canada.

Items marked with the CSA logo are CSA certied for the United

States and Canada.

NOTE: CSST approval from the above codes does not mean that CSST is approved for

use in all localities. It is the installer’s responsibility to conrm that CSST is accepted by

the local authority with jurisdiction over the installation site. Valencia Pipe Company

assumes no responsibility for materials or labor expenses incurred as a result of the

installer not verifying local approval.

Chapter 2: Description of System Components

2.1 Tubing

The HOME-FLEX® fuel gas piping system employs corrugated, exible, semi-rigid stainless

steel tubing with brass attachment ttings terminating in NPT pipe ttings for integration

into traditional rigid black pipe systems or direct connection to gas systems. Tubing is avail-

able in sizes of ½", ¾", and 1".

HOME-FLEX® tubing is jacketed with a yellow polyethylene cover clearly marked with gas

pressure rating, and EHD* (Equivalent Hydraulic Diameter). Tubing is available in lengths of

25, 75, 150 (1" only), and 250-feet (½" and ¾" only).

Part No. Size (in) EHD* (AGA Size)

Jacket OD

(max)

Inside diam-

eter (nom)

Wall Thickness

11-005 ½" 18 0.76" 0.551" 0.01"

11-007 ¾" 25 1.06" 0.827" 0.01"

11-010 1" 31 1.29" 1.06" 0.01"

* EHD (Equivalent Hydraulic Diameter): a relative measure of ow capacity. A higher EHD value indicates

greater ow capacity of pipe.

Part No. Size (in) Length

11-00525 ½" 25'

11-00575 ½" 75'

11-005250 ½" 250'

11-00725 ¾" 25'

11-00775 ¾" 75'

11-007250 ¾" 250'

11-01075 1" 75'

11-010150 1" 150'

Female

Fitting

Protective Jacket

CSST Tubing

Rubber O-ring*

Flange Nut

Non-Metallic Gasket

Male

Fitting

Retainer RingRetainer Ring

* The o-ring does not serve as a gas sealing mechanism in the assembly. See Section 4.2 for more information.

Figure 2.1 HOME-FLEX® Tubing and Fitting Assembly

2.2 Fittings

HOME-FLEX® ttings are available for ½", ¾", and 1" HOME-FLEX® tubing and allow for easy

connection to gas systems and accessories using standard NPT threads. (See Figure 2.1)

In addition to standard NPT adapter ttings, the following are also available: Tee ttings to

accommodate branch lines in tubing runs, reducer tees to integrate with dierent sized tub-

ing runs, and special termination anges for convenient gas appliance connections.

Part No. Description

11-436-005 ½" Male NPT x CSST

11-436-007 ¾" Male NPT x CSST

11-436-010 1" Male NPT x CSST

11-435-005 ½" Female NPT x CSST

11-435-007 ¾" Female NPT x CSST

11-435-010 1" Female NPT x CSST

11-401-005 ½" x ½" x ½" Tee

11-401-007 ¾" x ¾" x ½" Tee

11-401-010 1" x 1" x ¾" Tee

11-429-101

¾" CSST x ½" Male NPT

Reducer

11-429-005 ½" Coupler (CSST x CSST)

11-429-007 ¾" Coupler (CSST x CSST)

11-429-010 1" Coupler (CSST x CSST)

11-464-005 ½" Termination Flange

11-464-008 ¾" Termination Flange

11-464-010 1" Termination Flange

2.3 Striker Plates

Striker plates are used to protect CSST from puncture hazards when passed through studs,

joists, and other building materials.

Part No. Description

11-3070SP 4" x 9" Striker Plate

Description of System Components

2.4 Pressure Regulators

Pressure regulators are used in elevated pressure system installations (over 14 inches water

column, or ½ PSI) to reduce pressure to standard low pressure required for appliances.

Part No. Description

Maxitrol 325-3L

½" NPT 7-11" w.c. Gas Line

Pressure Regulator

(250,000 Btu/hr max)

Maxitrol 325-5AL

¾" NPT 7-11" w.c. Gas Line

Pressure Regulator

(425,000 Btu/hr max)

2.5 Manifolds

Manifolds allow for parallel installations of HOME-FLEX® tubing with runs to each appliance.

Manifolds are available with ½" or ¾" inlets and have four ½" or ¾" NPT outlets.

Part No. Description

11-050504 ½" x ½" x ½" Female NPT

11-070504 ¾" x ¾" x ½" Female NPT

11-100704 1" x 1" x ¾" Female NPT

2.6 Shut-o valves and Quick-Connect Devices

At pressures less than 1/2 PSI (3.45 kPa), manual shut-o valves (ball valves) must comply with

ANSI Z21.15 / CGA 9.1 Manually Operated Gas Valves for Appliances, Appliance Connector Valves

and Hose End Valves, or with ANSI/ASME B16.44 Manually Operated Metallic Gas Valves for Use

in Above Ground Piping Systems up to 5 PSI.

When operating at pressures at or exceeding 1/2 PSI, manual gas valves are to have a pressure

rating of at least 5 PSI (34.5 kPa) and must comply with ANSI/ASME B16.33 Manually Operated

Metallic Gas Valves for Use in Gas piping Systems Up to 125 Psig, or with IAS U.S. Requirement

No. 3-88 Manually Operated Gas Valve for Use in House Piping Systems, or with CGA 3.16 Lever

Operated Non-Lubricated Gas Shut-O Valves, or with CGA 3.11 Lever Operated Pressure Lubri-

cated Plug Type Gas Shut-O Valves, or with CGA CR91-002 Manually Operated Gas Valves for

Use on Gas Piping. Valves listed as complying with IAS U.S. Requirement 3-88 or CGA CR91-002

but not ASME B16.33 or CGA 3.11 are not to be installed outdoors.

Valves must be used in the following conditions:

a) Gas appliances must have an accessible ½ PSIG manual shut-o valve upstream of

connectors with a union to allow removal of appliance

b) An accessible manual gas shut-o valve is required upstream of each pressure

regulator on elevated pressure systems.

Part No. Description

HFSB-1515 ⁄" Female NPT Ball Valve

HFSB-2424 ½" Female NPT Ball Valve

HFSB-3434 ¾" Female NPT Ball Valve

HFSB-4444 1" Female NPT Ball Valve

Bonding Clamps

Quick-connect devices provide a safe and easy way to make connections to moveable out-

door gas appliances like barbecues and space heaters. Quick-connect devices used with

HOME-FLEX® gas piping systems must conform to ANSI Z21.15, CGA 9.1, 9.2, 6.9 and AGA/

CGA 7-90/CR94-001. A shut-o valve should be installed upstream of the quick-connect

device and remain in the o position when the quick-connect device is not in use. All instal-

lations and devices must conform with local codes. Quick-connect devices that can be used

with HOME-FLEX® gas piping systems include, but are not limited to, models in the M. B.

Sturgis 3/375 family of products.

2.7 Bonding Clamps

Bonding clamps are used to connect the CSST gas piping system to the structure’s existing

grounding system. Connection is to be made to a HOME-FLEX® tting or black-iron com-

ponent nearest the gas service entrance of the building (see Section 4.10 on page 31).

Connection is never to be made directly to the HOME-FLEX® tubing.

Part No. Description

11-05BC

Bronze UL 467 listed bonding

clamp for use with ½" and ¾"

systems

11-07BC

Bronze UL 467 listed bonding

clamp for use with ¾" ttings

2.8 Protection Devices

Like striker plates, HOME-FLEX® Flexible Protective Conduit is used to protect HOME-FLEX®

tubing from puncture hazards.

Part No. Description

11-12512

1¼" x 12" Flexible Protective Con-

duit (For use with ½" & ¾" CSST)

2.9 HOME-FLEX® Tubing Cutter

The HOME-FLEX® Tubing Cutter is specially designed to cut HOME-FLEX® and other brands of

CSST, as well as aluminum, brass, copper, and stainless steel tubing. It can accomodate tubing

with an outer diamter (O.D.) from 0.2" to 1.25".

Part No. Description

11-TC-02125

Tubing Cutter designed for ½", ¾"

and 1" HOME-FLEX® CSST

11-TCB-02 Pack of 2 replacement blades

Description of System Components

2.10 Replacement Parts

HOME-FLEX® ttings require a retainer ring, a non-metallic gasket, and an o-ring for proper

assembly (see Figure 2.1 on page 4). Should any of these components be damaged or

misplaced, packs of replacement rings are available.

Part No. Description

11-05C

Two each of replacement

rings, gaskets, and o-rings

for ½" ttings

11-07C

Two each of replacement

rings, gaskets, and o-rings

for ¾" ttings

11-10C

Two each of replacement

rings, gaskets, and o-rings

for 1" ttings

2.11 HOME-FLEX® Appliance Connectors

HOME-FLEX® CSST cannot be used to make direct connections to moveable appliances like

gas ranges or clothes dryers (see Section 4.6 on page 26). Connection to these appliances

should be made from a HOME-FLEX® Termination Flange tting to a HOME-FLEX® Appliance

Connector, or comparable device. Appliance Connectors are available in lengths of 12, 18, 24,

30, 36, 48, 60 and 72 inches.

Part No. Description

HFHC Series

3/8" O.D. (1/4" I.D.) tube suit-

able for water heaters and

devices with similar ow

requirements

HFDC Series

1/2" O.D. (3/8" I.D.) tube

suitable for dryers and

devices with similar ow

requirements

HFRC Series

5/8" O.D. (1/2" I.D.) tube

suitable for gas ranges and

devices with similar ow

requirements

HFSA Series

1" O.D. (3/4" I.D.) tube for

special applications

Chapter 3: Sizing and Congurations

3.1 Conguration

Before routing HOME-FLEX® tubing, it is advisable to prepare a sketch from the building

plans showing the locations of appliances to be serviced by the gas line, the load demands

of each appliance, the point of deliv-

ery (location of gas meter or second

stage liquid petroleum (LP) regulator),

system pressure, and possible piping

routes and lengths. Appliance load

requirements can be obtained from

the manufacturer’s nameplate locat-

ed on the appliance, or provided to

you by the builder or contractor. Per-

forming this sketch will ensure that

you select the proper HOME-FLEX®

tubing and accessories and avoid

potentially costly corrections to the

installation.

a) Determine local piping restrictions prior to purchasing and installing HOME-FLEX®

exible gas tubing. In particular, conrm that the local administrative authority

governing the installation location has accepted the use of Corrugated Stainless

Steel Tubing (CSST) exible gas piping. While CSST is accepted by the major

national and international code bodies, adoption of local codes can lag behind

these bodies, and/or have special requirements in addition to the national codes.

b) Determine the metered (supply) pressure of the gas source at the installation

location.

i) Natural Gas

• Standard low-pressure supply in North America is usually 6-7

inches water column (w.c.), alternatively designated as ¼ PSI.

• Medium pressure supply, such as 14 inches w.c. (½ PSI) provides

signicant CSST size reduction. Check with the local gas utility for

the availability of medium pressure. Most appliances distributed

in the US and Canada are designed to operate up to 14 inches w.c.

• Elevated pressure supply of 2 PSI is typically the highest pressure

supplied within residential buildings in the US and Canada. Instal-

lations for systems of this pressure always require installation of

a pounds-to-inches pressure regulator between the utility meter

and the appliances.

ii) Propane (Liqueed Petroleum or LP) Gas

• The pressure of LP systems are traditionally set to 11 inches w.c. at

the second stage regulator of the system.

• Like natural gas, elevated pressure settings from 14 inches w.c. to

2 and 5 PSI provide CSST size reductions. Check with the gas sup-

plier for availability. For 2 PSI and greater, use a gas line pressure

regulator set to 11 inches w.c. outlet pressure at the appliance

side of the LP system.

c) Determine the load demand of each appliance to be used at the installation loca-

tion and the total load for all appliances to determine the total capacity needed

for the installation. CFH/BTUH equivalents for natural gas or propane ow can be

obtained from the local gas utility or propane supplier. The capacity tables within

this guide should be used to determine the tubing size required to meet BTUH

input load requirements.

• For natural gas with a specic gravity of 0.60, one cubic foot per hour (1

CFH) is approximately 1,000 BTUH.

• For LP gas with a specic gravity of 1.52, one cubic foot per hour (1 CFH)

is approximately 2,500 BTUH.

For any given system and its load requirements, there are several piping system designs

available to the installer using HOME-FLEX® tubing. The sections below will outline several

demand scenarios and the dierent system options open to the installer. It would be impos-

sible to outline all the possible installation methods. It is the installer’s responsibility to use

the information supplied here to determine the best routing solution, using these examples

as a guide.

Low Pressure Systems

In low pressure systems, there are two installation options: series layouts where a main run

from the gas source splits to each appliance, and parallel layouts where the main run from

the gas source leads to a central distribution manifold from which individual runs service the

appliances.

Low Pressure Series Systems

Series systems are the most commonly used layout for black steel pipe installations with low

pressure supplies. In series

layouts, a main run from

the gas source is branched

with tees to each appli-

ance. The service pressure

downstream of the meter

is typically less than ½ PSI.

It is important to consider

the minimum pressure

supplied to any given

appliance in a series lay-

out. Most natural gas

appliances require a

minimum of 4" w.c. pres-

sure, while LP appliances

require a minimum of 10"

w.c. pressure. Local code

restrictions may dictate allowable pressure drop along any particular run.

Low Pressure Parallel Systems

Parallel systems have a central distribution manifold with branch runs to the appliances.

Typically, a main supply line is run from the gas supply to a manifold and "home runs" are

Gas

Meter

Water

Heater

25,000 BTUH

Range Oven

40,000 BTUH

Low Pressure

(5 - 7" w.c.)

Figure 3.1 A low pressure series layout

Gas

Meter

Water

Heater

25,000 BTUH

Range Oven

40,000 BTUH

Low Pressure

(5 - 7" w.c.)

Furnace

60,000 BTUH

Figure 3.2 A low pressure parallel layout

Sizing Methods and Examples

routed to each appliance location. Manifold stations are located as close as possible to the

appliance(s) with the greatest load. Parallel layouts are most commonly used in ¼ to ½ PSI

systems.

Dual Pressure Systems

Elevated pressure systems generally have a main line from the gas supply to one or more

gas pressure regulators and then a manifold with "home runs" to appliances. These runs may

branch o through use of a tee, if gas loads permit.

Elevated Pressure System

It is also possible to have

a complete elevated

pressure system where

the pressure regulators

are positioned at each

appliance. This method

is typically employed in

systems with high loads

or long runs.

Multiple Manifold System

Another variant used

with elevated pressure

is to have multiple man-

ifolds, each with a regulator before the manifold. This approach allows for large BTU load

demands while using smaller diameter tubing.

Hybrid Systems (Rigid pipe and CSST)

The use of both CSST and rigid black pipe can be advantageous to minimize the pressure

drops typically encountered on systems with high loads or long runs. For example, a paral-

lel system could require a larger diameter main branch to provide the total appliance load.

HOME-FLEX® is certied for use with black steel pipe and copper tubing gas piping systems.

3.2 Sizing Methods and Examples

This section will outline sizing procedures under several dierent circumstances to demon-

strate how to select the proper size and conguration of HOME-FLEX® exible gas tubing.

These examples are presented to demonstrate the process of using sizing tables to determine

necessary pipe size and conguration. Every installation is dierent and this requires that the

installer go through the processes outlined below for the proper sizing and conguration of

the gas piping system given the circumstances and requirements at the installation location.

Sizing Tables

All piping systems introduce pressure loss, the amount of which depends on the piping size

and the gas ow (in cubic feet per hour). When "sizing" a system, the installer determines the

smallest size piping that will deliver the ow required given the allowable amount of pres-

sure drop. Sizing tables provide the maximum load for a run given the gas pressure, allowable

pressure drop, size of pipe and the length of the run. Dierent sizing tables are used for each

combination of system pressure and pressure drop.

Allowable pressure drop is the maximum pressure loss that can occur and maintain supply

pressure for proper equipment or appliance operation. Natural gas appliances are generally

designed to function with a minimum pressure of 4 inches w.c. LP appliances are generally

designed for a minimum pressure of 10 inches w.c. The sizing tables in this guide should be

used to provide no less than 5 inches w.c. to natural gas appliances and 10.5 inches w.c. to LP

appliances. Allowable pressure drop can be calculated by subtracting the desired appliance

Gas

Meter

25,000 BTUH

Range Oven

40,000 BTUH

Elevated

Pressure

60,000 BTUH30,000 BTUH

Furnace

Water

Heater

Dryer

Figure 3.3 A dual pressure system layout

Sizing and Congurations

inlet pressure (recommended 5 inches w.c. for natural gas and 10.5 inches w.c. for natural gas)

from the gas source pressure (gas meter for natural gas or the secondary regulator for LP).

Low pressure series systems are sized using the "longest length method" (also known as the

"branch length method") in the same manner as low pressure black steel pipe systems. Tables

from the National Fuel Gas Code (NFPA 54) are used to calculate the sizing. Pressure drop in a

low pressure system is usually limited to ½ inch w.c.

For elevated pressure systems, there are two operating pressures downstream of the gas

source: the pressure set by the service regulator at the meter (usually 2 PSI) which leads to

the pounds-to-inches regulator. The proper drop between the meter and the regulator is usu-

ally 1 PSI, allowing a ¾ PSI regulator drop downstream while providing the ¼ PSI (6-7 inches

w.c.) required for appliances. Between the regulator and the appliances, sizing is calculated

like low pressure systems with the exception that the allowable pressure drop is 3 inches w.c.,

typically sized for one appliance installed as a "home run" from the manifold.

Low Pressure systems (Longest Length/Branch Method)

Sizing of the following systems is done by section. Each section is sized by determining the

total gas load for all appliances and the maximum distance (longest length) over which a

section delivers gas.

Example 1: Low Pressure System in a Series Arrangement (Figure 3.4)

In this installation, a small number of appliances are located near the natural gas source in

one general area. The short

runs and low appliance load

make it ideal for a series

arrangement.

Step 1 Size Section A: Deter-

mine the longest run from

the source that includes sec-

tion A and the total gas load

it must deliver.

• Meter to range oven is 20 feet (A + B).

• Meter to water heater is 27 feet (A + C).

• Maximum load carried by section A is 65,000 BTUH (range + water heater). Convert

to CFH by dividing by 1000 (for natural gas with a specic gravity of 0.60, 1 CFH =

1,000 BTUH). Maximum load is 65 CFH.

• Find the maximum capacity table that matches the system characteristics, in this

case, natural gas with a minimum gas pressure of 6-7 inches w.c. and a pressure

drop of 0.5 inches w.c. Table 7.1 is the correct table.

• Find the column in the length row that is greater than or equal to the longest run

in the system. The longest run in this system is 27 feet and the table has columns

for 25 and 30 feet. Never round down when sizing. The correct column is 30 feet.

• We then scan down the 30 feet column searching for a CFH value that is greater

than or equal to the total load of the system. At 30 feet, ½" tubing has a maximum

load of 42 CFH so it is not suitable for this system. The next size is ¾" with a maxi-

mum load of 116 CFH. ¾" tubing is the correct size for section A.

Gas

Meter

Water

Heater

25,000 BTUH

Range Oven

40,000 BTUH

Low Pressure

(5 - 7" w.c.)

Figure 3.4 Low Pressure System—Series Arrangement

Length of Runs:

A = 12' B = 8' C = 15'

Supply Pressure: 6" w.c.

Pressure Drop: 0.5" w.c.

Sizing Methods and Examples

Step 2 Size Section B: Determine the length of the run from the meter to the range oven and

the load delivered.

• The length from the meter to the range oven is 20 feet (A + B), and the load is 40

CFH (40,000 BTUH divided by 1000 CF per BTU).

• Consulting Table 7.1, we see that for a 20-foot run, ½" tubing will supply up to 51

CFH. The correct size tubing for section B is ½".

Step 3 Size Section C: Determine the length of the run from the meter to the water heater and

the load delivered.

• The length is 27 feet (A + C) and the load is 25 CFH (25,000 BTU).

• Consulting Table 7.1, we see that for a 30-foot run, ½" tubing will supply up to 42

CFH. The correct size for section C is ½".

Example 2: Medium Pressure in a Parallel Arrangement

This system is typical of a single family residential installation with several appliances. As it

is a medium-pressure system, the allowable pressure drop of 6 inches w.c. is greater than

what would have

been permissible

in a low pressure

system.

Step 1 Size Section A: Determine the longest run from the meter to any appliance:

• Meter (A) to water heater (D) is the longest run at 32 feet.

• The maximum load transported by section A is the total load of all appliances:

dryer + furnace + water heater + range oven = 155,000 BTU = 155 CFH.

• Consulting Table 7.4, the columns nearest 32' are 30' and a 40'. Because we must

use the length value that is greater than or equal to the measured run, the 40'

column is correct. Our total load is 155 CFH, and ½" tubing has a total maximum

capacity of 116 CFH at 40 feet, which is not enough for this system. ¾" Tubing has

a maximum capacity of 398 CFH. ¾" Tubing is the correct size.

Step 2 Size Section B: Determine the length from the meter to the dryer:

• A + B = 30 feet and the total load is the load of the dryer is 30,000 BTUH = 30 CFH.

• Table 7.4 shows that ½" tubing has a total load capacity of 133 CFH at 30 feet,

exceeding the load of the dryer, so ½" tubing is the correct size.

Step 3 Size Section C: Determine the length from the meter to the Furnace.

• A + C = 28 feet, and the total load is 60,000 BTUH = 60 CFH.

• Table 7.4 shows that ½" tubing has a total load of 133 CFH at 30 feet, so ½" tubing

is the correct size.

Gas

Meter

25,000 BTUH

Range Oven

40,000 BTUH

Elevated

Pressure

60,000 BTUH30,000 BTUH

Furnace

Water

Heater

Dryer

Figure 3.5 Medium Pressure System—Parallel Arrangement

Length of Runs:

A = 20' B = 10' C= 8'

D = 12' E = 10'

Supply: 12-14" w.c.

Pressure Drop: 6" w.c.

Sizing and Congurations

Step 4 Size Section D: Determine the length from the meter to the water heater.

• A + D = 32 feet, and the load of the water heater is 25,000 BTUH = 25 CFH.

• Table 7.4 shows that ½" tubing has a total load capacity of 116 CFH at 40 feet, so

½" tubing is the correct size.

Step 5 Size Section E: Determine the length from the Range oven to the Furnace.

• A + E= 30 feet and the load of the furnace is 40,000 BTUH = 40 CFH.

• Table 7.4 shows that ½" tubing, with a maximum capacity of 133 CFH, is correct.

Elevated Pressure Systems

Example 3: Elevated Pressure System in a Parallel Arrangement

In this example, an extended tubing run is required from the gas meter to the desired appli-

ance locations. This scenario is common in single and multifamily locations. 2 PSI elevated

systems are ideal for the long runs required in multifamily buildings that have a central gas

meter bank.

Step 1 Size Section A:

• Maximum load = furnace + range oven + water heater + dryer = 190,000 BTU = 190

CFH and the distance to the regulator is 100 feet.

• Supply pressure is 2 PSI and allowable drop is 1 PSI. Table 7.5 is the correct table.

• Scanning the 100' column, ½" tubing has a maximum capacity of 129 CFH which

is not adequate. ¾" Tubing has a maximum capacity of 471 CFH. As this meets or

exceeds our required capacity of 190 CFH, ¾" tubing is the correct size.

Step 2 Size Sections B-E: From the regulator outlet, the system is supplying 8 inches w.c. with

an allowable drop of 3 inches w.c. Table 7.3 is the correct table for this section of the system.

• Section B is 10 feet with a an appliance load of 90 CFH for the furnace. ½" Tubing

has a maximum capacity of 160 CFH at 10 feet, so ½" is the correct size.

• Section C is 20 feet with an appliance load of 40 CFH for the range oven. ½" Tubing

has a maximum capacity of 116 CFH at 20 feet, so ½" is the correct size.

• Section D has a length of 25 feet with an appliance load of 25 CFH. ½" Tubing has a

maximum capacity of 104 CFH at 25 feet, so ½" is the correct size.

• Section E has a length of 20 feet with an appliance load of 35 CFH. ½" Tubing has a

maximum capacity of 116 CFH at 20 feet, so ½" is the correct size.

Furnace

Gas

Meter

Water

Heater

25,000 BTUH

Range Oven

40,000 BTUH

Elevated

Pressure

2 PSI

Dryer

35,000 BTUH

Furnace

90,000 BTUH

Figure 3.6 Elevated Pressure System—Parallel Arrangement

Length of Runs:

A = 100' B = 10' C= 20'

D = 25' E = 20'

Supply Pressure: 2 PSI

Pressure Drop: 1 PSI to reg.,

3" w.c. from reg. to appliances

Sizing Methods and Examples

Example 4: Medium Pressure Parallel Arrangement with a Series Branch

This installation has a barbecue installed near the water heater. Given the number of appli-

ances, a parallel arrangement was selected for the system, with a single run supplying the

barbecue and the water heater in series.

Step 1 Size Section A: Determine the length of the lon-

gest run (from gas meter to appliance) and total load

required by the system.

• Total system load = range + dryer + furnace

+ water heater + BBQ = 205,000 BTUH =

205 CFH.

• Longest run is from meter to the BBQ: A + E + F = 60 feet.

• Supply pressure is 12-14 inches w.c. (½ PSI), and allowable pressure drop is 6

inches w.c., so Table 7.4 is the correct table.

• At a length of 60 feet, ½" tubing can supply a maximum of 96 CFH. The system

requires at least 205 CFH, so ½" is too small. ¾" Tubing can supply a maximum of

329 CFH. ¾" Tubing is the correct size.

Step 2 Size Section B: Measure the length from the meter to the range to determine

appropriate size.

• Total length is 35 feet (A + B), and appliance load is 40 CFH.

• 35 feet is not an option on the table, so we round up to 40 feet. ½" Tubing has a

maximum capacity of 116 CFH at 40 feet, so ½" is the correct size for this run.

Step 3 Size Section C: Determine the length from meter to the dryer:

• Total length is 35 feet (A + C) and appliance load is 30 CFH for the dryer.

• ½" Tubing has a maximum capacity of 116 CFH at 40 feet so ½" is the correct size.

Step 4 Size Section D: Determine the length from the meter to the furnace.

• Total Length is 45 feet (A + D) and appliance load is 60 CFH.

• ½" Tubing has a maximum capacity of 104 CFH at 50 feet so ½" is the correct size.

Step 5 Size Section E: Determine the longest length and total load for the section. As there are

two appliances serviced by this run, it is calculated as a series layout like Example 1.

• Section E serves both the water heater and BBQ, so total load is 75 CFH.

• The longest length is from the meter to the BBQ (A + E + F) = 60 feet.

• ½" Tubing has a maximum capacity of 96 CFH at 60 feet so ½" is the correct size.

Gas

Meter

Water

Heater

25,000 BTUH

Range Oven

40,000 BTUH

Med Pressure

(12-14" w.c.)

1/2 PSI

60,000 BTUH

Furnace

BBQ

50,000

BTUH

30,000 BTUH

Dryer

Figure 3.7 Medium Pressure System—Parallel Arrangement with Series Branch

Length of Runs:

A = 25' B = 10' C = 10' D = 20'

E = 20' F = 15' G = 5'

Supply Pressure: 12-14" w.c.

Pressure Drop: 6" w.c.

Sizing and Congurations

Step 6 Size Section F: Determine the total length and load.

• The BBQ load is 50 CFH and the length is 60 feet (A + E + F).

• ½" Tubing has a maximum capacity of 96 CFH at 60 feet so ½" is the correct size.

Step 7 Size Section G: Determine the total length and load.

• The water heater load is 25 CFH and the length is 50 feet (A + E + G).

• ½" Tubing has a maximum capacity of 104 CFH at 50 feet, so ½" is the correct size.

Hybrid CSST & Black Iron Rigid Pipe Systems

In low and medium pressure systems with high loads and/or long runs, it can be advanta-

geous to use both black steel pipe and HOME-FLEX® tubing to minimize pressure drops.

Sizing Hybrid HOME-FLEX® and Black Iron Systems

Proper sizing of hybrid HOME-FLEX® and rigid black steel pipe requires the use of the standard

gas piping capacity tables used for black steel pipe (these can be found in many plumbing

and mechanical codes as well as the National Fuel Gas Code) as well as the HOME-FLEX®

capacity tables in this manual. For your convenience, a black steel capacity table for sizing is

printed in Table 7.11 (p. 43) of this book.

Example 5: Low Pressure Hybrid System in a Series Arrangement

The system in Figure 3.8 is a commercial building with three unit heaters and a water heater.

The source is standard low pressure with a 6 inch w.c. supply and 0.5 inch w.c. maximum

allowable pressure drop. Sizing this system requires sizing the rigid black pipe section as well

as the HOME-FLEX® CSST runs to the appliances.

Step 1 Size the rigid black steel pipe: Determine

length of longest run and total load.

• The longest run from the meter is A1 +

A2 + A3 + A4 + E = 70 feet.

• Total load is 600,000 BTUH = 600 CFH.

Consulting Table 7.11, at a 70 foot

length, the diameter of black steel

pipe that can supply 600 CFH or greater is 1½" with a maximum capacity of 750

CFH. The correct size for section A1 is 1½".

• To size section A2, we can reduce the load already carried by A1, in this case 200

CFH from the rst heater. The length, however, remains 70 feet. Total load then is

A1 A2 A3 A4

B C D

Gas

Meter

Low Pressure

(6" w.c.)

60000

BTUH

200,000

BTUH

Heater 1

190,000

BTUH

Heater 2

150,000

BTUH

Heater 3

Water

Heater

Figure 3.8 Low Pressure Hybrid System—Series Arrangement

Length of Runs:

A1 = 10' A2 = 20' A3 = 20' A4 = 5'

B = 10' C = 10' D = 10' E = 15'

Supply Pressure: 6" w.c.

Pressure Drop: 0.5" w.c.

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HOME-FLEX 11-436-007 Installation guide

HOME-FLEX 11-436-007 Installation guide

HOME-FLEX 11-436-007 Installation guide

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